Theresa May must start Brexit talks as soon as possible and prove she is making progress with the EU if she wants to restore confidence among British businesses, economists warn.
Investment could tumble following the general election as companies hold back on major spending plans at a time of intense uncertainty, while poorly thought-through schemes to intervene in businesses risk a "chilling effect" on the economy.
Economists want the Prime Minister to show quick results to stop a slump that could damage the economy, and business leaders want her to reinforce a pro-enterprise message.
"The to-do list is long and the clock is ticking. By pursuing some early wins we can create the momentum towards a good deal for businesses," said Carolyn Fairbairn, director-general of the Confederation of British Industry, writing in The Sunday Telegraph.
She wants Mrs May to give priority to "ensuring the rights of EU citizens, progressing transitional arrangements and shifting the focus of formal talks to future trading relationships" in the next 100 days, as "Britain needs to be seen - and heard - as open, pro-market and pro-enterprise".